Theodolite.



H. BRANDENBERG.

THEODOLITE.

APPLICATION FILED PEB.15, 1912.

Patented Feb. 16, 1915.

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THEODOLITE.

APPLICATION FILED FEB-15 1912. 1,128,578. Patented Feb. 16, 1915.

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H. BRANDENBERG.

THEODOLITE.

APPLICATION FILED FEB.15,1912.

Patented Feb. 16, 1915.

4 SHEET$SHEET 3 H. BRANDENBERG.

THEODOLITE.

APPLICATION FILED FEB 15, 1912.

1,128,578. Patented Feb. 16, 1915.

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C 6' @4021 Z zfiZ Brandt 205w HEINZ BRANDENBERG, 0F SCHWIENTOCHLOW'ITZ, GERMANY.

THEODOLITE.

Application filed February 15, 1912.

To all whom it may concern:

Be it known that I, HEINZ BRANDENBERG, a citizen of the German Empire, and residing at Schwientochlowitz, Upper Silesia, German Empire, have invented certain new and useful Improvements in Theodolites, of which the following is a description.

The present invention relates to theodolites for measuring horizontal and vertical angles.

The instrument differs from the known ones mainly in the arrangement of alidade and the graduated are, which are located around a common central axis, mounted to swing around a supporting spike or peg. By this means the centering and horizontal adjustment of the instrument are rendered reliable and invariable. Both the aXis of the alidade, as also that of the graduated arc are in the form of sleeves adapted to rotate around each other and also arounda common axis.

By this means very reliable operation of the apparatus is attained and it is rendered especially adaptable for mine surveying pur poses.

In the accompanying drawing an embodiment of the invention is illustrated, Figure 1 being a side elevation partly in section, Fig. 2 a similar view seen at right angles to the View in Fig. 1, Fig. 3 a plan of the de vice with the steel peg or spike in plan view and the sleeve fitting the same in section, Fig. t shows the graduation of the main arc, Fig. 5 that of the vertical arc, Figs. 6 and 7 show the signals in sectional side elevation and plan, Fig. 8 is a sectional view of a part of the spike and sleeve and Fig. 8 is a cross section through the same parts, and Figs. 9 and 10 show a modified form of the central axis in vertical section and plan respectively.

The instrument is suspended on the peg or spike 1 by means of its conical sleeve 2, the jaws 3 of which may be pressed together by means of the butterfly nut and screw 4:, 5. A second screw 6 serves to clamp the sleeve to the spike. Any unintentional loosening of the sleeve is prevented by means of a bolt 8 mounted on a spring? and engaging an annular groove of the spike. In order to disengage the sleeve from the spike, the clamping screw 6 must first be loosened and the bolt 8 then withdrawn from the groove by means of its button. A bending around or breaking of the spring 7 is prevented by the lug 9 (Fig. 6).

Specification of Letters Patent.

Patented Feb. 16, 1915.

Serial No. 677,712.

The jaws 3 support the ball end (Fig. 2) of the axis 10 of the pendulum theodolite, on the lower, slightly enlarged end of which, the sleeves 11 and 12 are mounted to turn, being retained in position by means of the annular disk 13 secured by the screw 14. At the upper end a ring 15 screwed or otherwise secured to the sleeve 11 holds the two sleeves 11 and 12 in proper relative position. The lower part of the sleeve 11 is connected to a disk having the graduations 16 around its edge, around which the verniers 17 of the disk of the sleeve 12 are located.

The fine adjustment for the graduated are 16 is arranged in the usual manner at 18 and that of the alidade arc 17 at 19. The latter is mounted on a screw spindle 20 supported on a collar 20, which simultaneously prevents the upward movement of the sleeve 11, on the spindle 10.

A frame 21 is suspended from the lower end of the sleeve 11, in which frame the telescope 22 is mounted, the position of the axis of the said telescope being adjustable by means of the screw 2%. The telescope is provided as usual with the vertical are 25 and the fine adjustment 26.

The instrument is adjusted in the horizontal plane by means of the box air levels 27 and 28. The latter is mounted on a special plate 29, screwed to the frame 21, so that the air levels may be removed with the plate, without loosing their adjustment.

In Fig. 4 the scale of the main arc is illustrated, which is reversed as regards that of the ordinary theodolite, and Fig. 5 shows the scale of the circle of altitude.

The distance of the ball 34 to be sighted with the swinging theodolite, from the center line of the attachment sleeve, must be exactly equal to the distance of the center line of the telescope from the center of the ball of the axis 10 of the instrument, in order to insure the line of sight being parallelto the connecting line of the point of suspension of the instrument. In order to avoid inaccuracies in the polygonal angles, the distance a-b (Fig. 1) must be the same both with the pendulum theodolite and with the signals.

The instrument might also be employed in an upright position, or on a stand. With this object in view the top of the stand illustrated in Fig. 8 is provided with an upwardly extending pin 35, which corresponds in shape with the front end of-the spike or peg 1.

In mines, the spike is driveninto ,-,the,-woo cl I Work, between the'hrielis'otbrick vvoihhr 5 into the coal or partition rock and in order to prevent deformation of the head of the ike i edv ategeqil ly; provided; a cross boring for the reception of a striking iron or bolt. h ,novelty of th presen instrum n consists in the arrangement of the main and Vernier arcs or; CiICleS of the theodolite onv a fial spindle 1O "and inY the arrangement pe: o'f the spindle von this spindle.

1 :In th medifieatie i ust e i Fig Qfandi IO; thej horizontal adjustment 7 of the theodo'lite V is faoi'litated. 1111 this case, 'the javvs BBTeIigage the' upper ball, 37 of'a tube 38 fwhic'h'f'is"fvvidened' out toward its lower 20 end, Q "d isnprovidedjvvi'th' four arnis '39 fa'rranged the fo i'jrnjofalcrosafthe oeieeefids fis i z o d m:- hook-like and provided "With I heringi th ball-v.,37mi vey indni a its upper partfi hemisphe'rioalj vtowai d its low rjpart, 'alsl'difflar e'd' at ithejbottom. 11A spi; le 3410., he l it bal 41f mounte ,i ht part3?the'j'lbw r, end o thi spindle e g geSjsifiT. a? seeond...spind1e1&2 having; a

its "upper and four horizontally extending rms 4:3,, in .,,.th ferm, o ,7 fe 'ess'glthe Ls'iiid rm' ""h ing".iscreiv hlxeacle v.eiel legl "e.

r ng'it reugh. theibe rg i t arms; 39. 1B3 man primes-44c; ai ing; 'ed edges and claihpii' jgfp1atesA' ,the sp n es LOflanldji Q a b adi lste .i a y de ired manner around the ball4l. closinglsor'evvflm is ,s rewe in el h itepuo rt hp lew.h lls-t3? dg pl ievexitanyupwardmevem n ,of;4 vhall T i exte e s ylin rical fi pmg 1 ae s ,efithe arm d r d to ifitwt nter iQ i h Yflhel'l weiiiend'b flth Q92!!! '9 hie v iae eemmhta ss j59 the apparatus'is otherwise the same as that 45 illustrated in Figs. 1 and 2.

In:e iliais ath aharizenta te j vice illustrated in Figs. 9 and 10, the aprvparatus is first adjusted by hand, so that the air levels register approximately and x;theiclamping screw & is then tightenediup. ,Theexaot vadj str r er1t of the air levels is 'then"e'fiectedbyrieans of the screws 44.

The present pendulum theodolite is intendeduasra. substitute forjthe eom pass and th jse o nipass flinstrumentswhich are conted ifjor; taking measurements in the pre ll lc eff ,iron,1f'and i it is also to a be empley lfe' i i 'g urpee fo e t n polygonal easurements lz a rn my. invention:-

Z ,1. asuspended;1theodolite comprising a 'ceii't'r'a'l axis 'lOh'aving two sleeves ll and .2v areun l h i m th e mbi ia b dfatfthe ripper end'of [the said v sleeve'2 having -javvs 3 tojembrace the s d jbalh a' graduated arc 16'integral jthe"said' sleievef'll, an a'lidacle are 'jgraduate'd aro and'eombijned eis d'f 'leeve" l2 and'lafinefadjusti dl 20 attached directly to g2 Infa suspendedtheodolite comprising afl ceritral If. f", the, combination of a ball formedatjtheupperg'end of said axis, ahollovv upporting; having hollQ sleeve i lrbal i in .1 li engag i ball, m ans for adjusting the said ball and hollow sleeve as regards. each othenie amp ng 1' W t i1ithe.presierieee tWe W tn e H INZ gBRANDENBE lwitnesw I 7 iLee l K s 9 A s d s i I? WPWWWP E te 

